blob: ebe5718baa319bc004cea0231a9038ce84e1c55f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * PACKET - implements raw packet sockets.
7 *
Jesper Juhl02c30a82005-05-05 16:16:16 -07008 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Alan Cox, <gw4pts@gw4pts.ampr.org>
11 *
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +090012 * Fixes:
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * Alan Cox : verify_area() now used correctly
14 * Alan Cox : new skbuff lists, look ma no backlogs!
15 * Alan Cox : tidied skbuff lists.
16 * Alan Cox : Now uses generic datagram routines I
17 * added. Also fixed the peek/read crash
18 * from all old Linux datagram code.
19 * Alan Cox : Uses the improved datagram code.
20 * Alan Cox : Added NULL's for socket options.
21 * Alan Cox : Re-commented the code.
22 * Alan Cox : Use new kernel side addressing
23 * Rob Janssen : Correct MTU usage.
24 * Dave Platt : Counter leaks caused by incorrect
25 * interrupt locking and some slightly
26 * dubious gcc output. Can you read
27 * compiler: it said _VOLATILE_
28 * Richard Kooijman : Timestamp fixes.
29 * Alan Cox : New buffers. Use sk->mac.raw.
30 * Alan Cox : sendmsg/recvmsg support.
31 * Alan Cox : Protocol setting support
32 * Alexey Kuznetsov : Untied from IPv4 stack.
33 * Cyrus Durgin : Fixed kerneld for kmod.
34 * Michal Ostrowski : Module initialization cleanup.
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +090035 * Ulises Alonso : Frame number limit removal and
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 * packet_set_ring memory leak.
Eric W. Biederman0fb375f2005-09-21 00:11:37 -070037 * Eric Biederman : Allow for > 8 byte hardware addresses.
38 * The convention is that longer addresses
39 * will simply extend the hardware address
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +090040 * byte arrays at the end of sockaddr_ll
Eric W. Biederman0fb375f2005-09-21 00:11:37 -070041 * and packet_mreq.
Johann Baudy69e3c752009-05-18 22:11:22 -070042 * Johann Baudy : Added TX RING.
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 *
44 * This program is free software; you can redistribute it and/or
45 * modify it under the terms of the GNU General Public License
46 * as published by the Free Software Foundation; either version
47 * 2 of the License, or (at your option) any later version.
48 *
49 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +090050
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <linux/mm.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080053#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include <linux/fcntl.h>
55#include <linux/socket.h>
56#include <linux/in.h>
57#include <linux/inet.h>
58#include <linux/netdevice.h>
59#include <linux/if_packet.h>
60#include <linux/wireless.h>
Herbert Xuffbc6112007-02-04 23:33:10 -080061#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/kmod.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020063#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#include <net/ip.h>
65#include <net/protocol.h>
66#include <linux/skbuff.h>
67#include <net/sock.h>
68#include <linux/errno.h>
69#include <linux/timer.h>
70#include <asm/system.h>
71#include <asm/uaccess.h>
72#include <asm/ioctls.h>
73#include <asm/page.h>
Al Viroa1f8e7f72006-10-19 16:08:53 -040074#include <asm/cacheflush.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#include <asm/io.h>
76#include <linux/proc_fs.h>
77#include <linux/seq_file.h>
78#include <linux/poll.h>
79#include <linux/module.h>
80#include <linux/init.h>
Herbert Xu905db442009-01-30 14:12:06 -080081#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83#ifdef CONFIG_INET
84#include <net/inet_common.h>
85#endif
86
Linus Torvalds1da177e2005-04-16 15:20:36 -070087/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 Assumptions:
89 - if device has no dev->hard_header routine, it adds and removes ll header
90 inside itself. In this case ll header is invisible outside of device,
91 but higher levels still should reserve dev->hard_header_len.
92 Some devices are enough clever to reallocate skb, when header
93 will not fit to reserved space (tunnel), another ones are silly
94 (PPP).
95 - packet socket receives packets with pulled ll header,
96 so that SOCK_RAW should push it back.
97
98On receive:
99-----------
100
101Incoming, dev->hard_header!=NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700102 mac_header -> ll header
103 data -> data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
105Outgoing, dev->hard_header!=NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700106 mac_header -> ll header
107 data -> ll header
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
109Incoming, dev->hard_header==NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700110 mac_header -> UNKNOWN position. It is very likely, that it points to ll
111 header. PPP makes it, that is wrong, because introduce
YOSHIFUJI Hideakidb0c58f2007-07-19 10:44:35 +0900112 assymetry between rx and tx paths.
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700113 data -> data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115Outgoing, dev->hard_header==NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700116 mac_header -> data. ll header is still not built!
117 data -> data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
119Resume
120 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
121
122
123On transmit:
124------------
125
126dev->hard_header != NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700127 mac_header -> ll header
128 data -> ll header
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130dev->hard_header == NULL (ll header is added by device, we cannot control it)
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700131 mac_header -> data
132 data -> data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
134 We should set nh.raw on output to correct posistion,
135 packet classifier depends on it.
136 */
137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138/* Private packet socket structures. */
139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140struct packet_mclist
141{
142 struct packet_mclist *next;
143 int ifindex;
144 int count;
145 unsigned short type;
146 unsigned short alen;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -0700147 unsigned char addr[MAX_ADDR_LEN];
148};
149/* identical to struct packet_mreq except it has
150 * a longer address field.
151 */
152struct packet_mreq_max
153{
154 int mr_ifindex;
155 unsigned short mr_type;
156 unsigned short mr_alen;
157 unsigned char mr_address[MAX_ADDR_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158};
David S. Millera2efcfa2007-05-29 13:12:50 -0700159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160#ifdef CONFIG_PACKET_MMAP
Johann Baudy69e3c752009-05-18 22:11:22 -0700161static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
162 int closing, int tx_ring);
163
164struct packet_ring_buffer {
165 char * *pg_vec;
166 unsigned int head;
167 unsigned int frames_per_block;
168 unsigned int frame_size;
169 unsigned int frame_max;
170
171 unsigned int pg_vec_order;
172 unsigned int pg_vec_pages;
173 unsigned int pg_vec_len;
174
175 atomic_t pending;
176};
177
178struct packet_sock;
179static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180#endif
181
182static void packet_flush_mclist(struct sock *sk);
183
184struct packet_sock {
185 /* struct sock has to be the first member of packet_sock */
186 struct sock sk;
187 struct tpacket_stats stats;
188#ifdef CONFIG_PACKET_MMAP
Johann Baudy69e3c752009-05-18 22:11:22 -0700189 struct packet_ring_buffer rx_ring;
190 struct packet_ring_buffer tx_ring;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 int copy_thresh;
192#endif
193 struct packet_type prot_hook;
194 spinlock_t bind_lock;
Herbert Xu905db442009-01-30 14:12:06 -0800195 struct mutex pg_vec_lock;
Herbert Xu8dc41942007-02-04 23:31:32 -0800196 unsigned int running:1, /* prot_hook is attached*/
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -0700197 auxdata:1,
198 origdev:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 int ifindex; /* bound device */
Al Viro0e11c912006-11-08 00:26:29 -0800200 __be16 num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 struct packet_mclist *mclist;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202#ifdef CONFIG_PACKET_MMAP
203 atomic_t mapped;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700204 enum tpacket_versions tp_version;
205 unsigned int tp_hdrlen;
Patrick McHardy8913336a2008-07-18 18:05:19 -0700206 unsigned int tp_reserve;
Johann Baudy69e3c752009-05-18 22:11:22 -0700207 unsigned int tp_loss:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208#endif
209};
210
Herbert Xuffbc6112007-02-04 23:33:10 -0800211struct packet_skb_cb {
212 unsigned int origlen;
213 union {
214 struct sockaddr_pkt pkt;
215 struct sockaddr_ll ll;
216 } sa;
217};
218
219#define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
Herbert Xu8dc41942007-02-04 23:31:32 -0800220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221#ifdef CONFIG_PACKET_MMAP
222
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700223static void __packet_set_status(struct packet_sock *po, void *frame, int status)
224{
225 union {
226 struct tpacket_hdr *h1;
227 struct tpacket2_hdr *h2;
228 void *raw;
229 } h;
230
231 h.raw = frame;
232 switch (po->tp_version) {
233 case TPACKET_V1:
234 h.h1->tp_status = status;
Johann Baudy69e3c752009-05-18 22:11:22 -0700235 flush_dcache_page(virt_to_page(&h.h1->tp_status));
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700236 break;
237 case TPACKET_V2:
238 h.h2->tp_status = status;
Johann Baudy69e3c752009-05-18 22:11:22 -0700239 flush_dcache_page(virt_to_page(&h.h2->tp_status));
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700240 break;
Johann Baudy69e3c752009-05-18 22:11:22 -0700241 default:
242 printk(KERN_ERR "TPACKET version not supported\n");
243 BUG();
244 }
245
246 smp_wmb();
247}
248
249static int __packet_get_status(struct packet_sock *po, void *frame)
250{
251 union {
252 struct tpacket_hdr *h1;
253 struct tpacket2_hdr *h2;
254 void *raw;
255 } h;
256
257 smp_rmb();
258
259 h.raw = frame;
260 switch (po->tp_version) {
261 case TPACKET_V1:
262 flush_dcache_page(virt_to_page(&h.h1->tp_status));
263 return h.h1->tp_status;
264 case TPACKET_V2:
265 flush_dcache_page(virt_to_page(&h.h2->tp_status));
266 return h.h2->tp_status;
267 default:
268 printk(KERN_ERR "TPACKET version not supported\n");
269 BUG();
270 return 0;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700271 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272}
Johann Baudy69e3c752009-05-18 22:11:22 -0700273
274static void *packet_lookup_frame(struct packet_sock *po,
275 struct packet_ring_buffer *rb,
276 unsigned int position,
277 int status)
278{
279 unsigned int pg_vec_pos, frame_offset;
280 union {
281 struct tpacket_hdr *h1;
282 struct tpacket2_hdr *h2;
283 void *raw;
284 } h;
285
286 pg_vec_pos = position / rb->frames_per_block;
287 frame_offset = position % rb->frames_per_block;
288
289 h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size);
290
291 if (status != __packet_get_status(po, h.raw))
292 return NULL;
293
294 return h.raw;
295}
296
297static inline void *packet_current_frame(struct packet_sock *po,
298 struct packet_ring_buffer *rb,
299 int status)
300{
301 return packet_lookup_frame(po, rb, rb->head, status);
302}
303
304static inline void *packet_previous_frame(struct packet_sock *po,
305 struct packet_ring_buffer *rb,
306 int status)
307{
308 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
309 return packet_lookup_frame(po, rb, previous, status);
310}
311
312static inline void packet_increment_head(struct packet_ring_buffer *buff)
313{
314 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
315}
316
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317#endif
318
319static inline struct packet_sock *pkt_sk(struct sock *sk)
320{
321 return (struct packet_sock *)sk;
322}
323
324static void packet_sock_destruct(struct sock *sk)
325{
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700326 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
327 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
329 if (!sock_flag(sk, SOCK_DEAD)) {
330 printk("Attempt to release alive packet socket: %p\n", sk);
331 return;
332 }
333
Pavel Emelyanov17ab56a2007-11-10 21:38:48 -0800334 sk_refcnt_debug_dec(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335}
336
337
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800338static const struct proto_ops packet_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800340static const struct proto_ops packet_ops_spkt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700342static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343{
344 struct sock *sk;
345 struct sockaddr_pkt *spkt;
346
347 /*
348 * When we registered the protocol we saved the socket in the data
349 * field for just this event.
350 */
351
352 sk = pt->af_packet_priv;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 /*
355 * Yank back the headers [hope the device set this
356 * right or kerboom...]
357 *
358 * Incoming packets have ll header pulled,
359 * push it back.
360 *
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -0700361 * For outgoing ones skb->data == skb_mac_header(skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 * so that this procedure is noop.
363 */
364
365 if (skb->pkt_type == PACKET_LOOPBACK)
366 goto out;
367
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900368 if (dev_net(dev) != sock_net(sk))
Denis V. Lunevd12d01d2007-11-19 22:28:35 -0800369 goto out;
370
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
372 goto oom;
373
374 /* drop any routing info */
Eric Dumazetadf30902009-06-02 05:19:30 +0000375 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
Phil Oester84531c22005-07-12 11:57:52 -0700377 /* drop conntrack reference */
378 nf_reset(skb);
379
Herbert Xuffbc6112007-02-04 23:33:10 -0800380 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -0700382 skb_push(skb, skb->data - skb_mac_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
384 /*
385 * The SOCK_PACKET socket receives _all_ frames.
386 */
387
388 spkt->spkt_family = dev->type;
389 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
390 spkt->spkt_protocol = skb->protocol;
391
392 /*
393 * Charge the memory to the socket. This is done specifically
394 * to prevent sockets using all the memory up.
395 */
396
397 if (sock_queue_rcv_skb(sk,skb) == 0)
398 return 0;
399
400out:
401 kfree_skb(skb);
402oom:
403 return 0;
404}
405
406
407/*
408 * Output a raw packet to a device layer. This bypasses all the other
409 * protocol layers and you must therefore supply it with a complete frame
410 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900411
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
413 struct msghdr *msg, size_t len)
414{
415 struct sock *sk = sock->sk;
416 struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name;
417 struct sk_buff *skb;
418 struct net_device *dev;
Al Viro0e11c912006-11-08 00:26:29 -0800419 __be16 proto=0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 int err;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900421
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 /*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900423 * Get and verify the address.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 */
425
426 if (saddr)
427 {
428 if (msg->msg_namelen < sizeof(struct sockaddr))
429 return(-EINVAL);
430 if (msg->msg_namelen==sizeof(struct sockaddr_pkt))
431 proto=saddr->spkt_protocol;
432 }
433 else
434 return(-ENOTCONN); /* SOCK_PACKET must be sent giving an address */
435
436 /*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900437 * Find the device first to size check it
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 */
439
440 saddr->spkt_device[13] = 0;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900441 dev = dev_get_by_name(sock_net(sk), saddr->spkt_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 err = -ENODEV;
443 if (dev == NULL)
444 goto out_unlock;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900445
David S. Millerd5e76b02007-01-25 19:30:36 -0800446 err = -ENETDOWN;
447 if (!(dev->flags & IFF_UP))
448 goto out_unlock;
449
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 /*
451 * You may not queue a frame bigger than the mtu. This is the lowest level
452 * raw protocol and you must do your own fragmentation at this level.
453 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900454
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 err = -EMSGSIZE;
Kris Katterjohn8ae55f02006-01-23 16:28:02 -0800456 if (len > dev->mtu + dev->hard_header_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 goto out_unlock;
458
459 err = -ENOBUFS;
460 skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL);
461
462 /*
463 * If the write buffer is full, then tough. At this level the user gets to
464 * deal with the problem - do your own algorithmic backoffs. That's far
465 * more flexible.
466 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900467
468 if (skb == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 goto out_unlock;
470
471 /*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900472 * Fill it in
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900474
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 /* FIXME: Save some space for broken drivers that write a
476 * hard header at transmission time by themselves. PPP is the
477 * notable one here. This should really be fixed at the driver level.
478 */
479 skb_reserve(skb, LL_RESERVED_SPACE(dev));
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700480 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
482 /* Try to align data part correctly */
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700483 if (dev->header_ops) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 skb->data -= dev->hard_header_len;
485 skb->tail -= dev->hard_header_len;
486 if (len < dev->hard_header_len)
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700487 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 }
489
490 /* Returns -EFAULT on error */
491 err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
492 skb->protocol = proto;
493 skb->dev = dev;
494 skb->priority = sk->sk_priority;
495 if (err)
496 goto out_free;
497
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 /*
499 * Now send it
500 */
501
502 dev_queue_xmit(skb);
503 dev_put(dev);
504 return(len);
505
506out_free:
507 kfree_skb(skb);
508out_unlock:
509 if (dev)
510 dev_put(dev);
511 return err;
512}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
David S. Millerdbcb5852007-01-24 15:21:02 -0800514static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
515 unsigned int res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516{
517 struct sk_filter *filter;
518
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700519 rcu_read_lock_bh();
520 filter = rcu_dereference(sk->sk_filter);
David S. Millerdbcb5852007-01-24 15:21:02 -0800521 if (filter != NULL)
522 res = sk_run_filter(skb, filter->insns, filter->len);
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700523 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
David S. Millerdbcb5852007-01-24 15:21:02 -0800525 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526}
527
528/*
529 This function makes lazy skb cloning in hope that most of packets
530 are discarded by BPF.
531
532 Note tricky part: we DO mangle shared skb! skb->data, skb->len
533 and skb->cb are mangled. It works because (and until) packets
534 falling here are owned by current CPU. Output packets are cloned
535 by dev_queue_xmit_nit(), input packets are processed by net_bh
536 sequencially, so that if we return skb to original state on exit,
537 we will not harm anyone.
538 */
539
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700540static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541{
542 struct sock *sk;
543 struct sockaddr_ll *sll;
544 struct packet_sock *po;
545 u8 * skb_head = skb->data;
546 int skb_len = skb->len;
David S. Millerdbcb5852007-01-24 15:21:02 -0800547 unsigned int snaplen, res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
549 if (skb->pkt_type == PACKET_LOOPBACK)
550 goto drop;
551
552 sk = pt->af_packet_priv;
553 po = pkt_sk(sk);
554
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900555 if (dev_net(dev) != sock_net(sk))
Denis V. Lunevd12d01d2007-11-19 22:28:35 -0800556 goto drop;
557
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 skb->dev = dev;
559
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700560 if (dev->header_ops) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 /* The device has an explicit notion of ll header,
562 exported to higher levels.
563
564 Otherwise, the device hides datails of it frame
565 structure, so that corresponding packet head
566 never delivered to user.
567 */
568 if (sk->sk_type != SOCK_DGRAM)
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -0700569 skb_push(skb, skb->data - skb_mac_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 else if (skb->pkt_type == PACKET_OUTGOING) {
571 /* Special case: outgoing packets have ll header at head */
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -0300572 skb_pull(skb, skb_network_offset(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 }
574 }
575
576 snaplen = skb->len;
577
David S. Millerdbcb5852007-01-24 15:21:02 -0800578 res = run_filter(skb, sk, snaplen);
579 if (!res)
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700580 goto drop_n_restore;
David S. Millerdbcb5852007-01-24 15:21:02 -0800581 if (snaplen > res)
582 snaplen = res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
584 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
585 (unsigned)sk->sk_rcvbuf)
586 goto drop_n_acct;
587
588 if (skb_shared(skb)) {
589 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
590 if (nskb == NULL)
591 goto drop_n_acct;
592
593 if (skb_head != skb->data) {
594 skb->data = skb_head;
595 skb->len = skb_len;
596 }
597 kfree_skb(skb);
598 skb = nskb;
599 }
600
Herbert Xuffbc6112007-02-04 23:33:10 -0800601 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
602 sizeof(skb->cb));
603
604 sll = &PACKET_SKB_CB(skb)->sa.ll;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 sll->sll_family = AF_PACKET;
606 sll->sll_hatype = dev->type;
607 sll->sll_protocol = skb->protocol;
608 sll->sll_pkttype = skb->pkt_type;
Peter P Waskiewicz Jr8032b462007-11-10 22:03:25 -0800609 if (unlikely(po->origdev))
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -0700610 sll->sll_ifindex = orig_dev->ifindex;
611 else
612 sll->sll_ifindex = dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
Stephen Hemmingerb95cce32007-09-26 22:13:38 -0700614 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615
Herbert Xuffbc6112007-02-04 23:33:10 -0800616 PACKET_SKB_CB(skb)->origlen = skb->len;
Herbert Xu8dc41942007-02-04 23:31:32 -0800617
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 if (pskb_trim(skb, snaplen))
619 goto drop_n_acct;
620
621 skb_set_owner_r(skb, sk);
622 skb->dev = NULL;
Eric Dumazetadf30902009-06-02 05:19:30 +0000623 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
Phil Oester84531c22005-07-12 11:57:52 -0700625 /* drop conntrack reference */
626 nf_reset(skb);
627
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 spin_lock(&sk->sk_receive_queue.lock);
629 po->stats.tp_packets++;
630 __skb_queue_tail(&sk->sk_receive_queue, skb);
631 spin_unlock(&sk->sk_receive_queue.lock);
632 sk->sk_data_ready(sk, skb->len);
633 return 0;
634
635drop_n_acct:
636 spin_lock(&sk->sk_receive_queue.lock);
637 po->stats.tp_drops++;
638 spin_unlock(&sk->sk_receive_queue.lock);
639
640drop_n_restore:
641 if (skb_head != skb->data && skb_shared(skb)) {
642 skb->data = skb_head;
643 skb->len = skb_len;
644 }
645drop:
Neil Hormanead2ceb2009-03-11 09:49:55 +0000646 consume_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 return 0;
648}
649
650#ifdef CONFIG_PACKET_MMAP
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700651static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652{
653 struct sock *sk;
654 struct packet_sock *po;
655 struct sockaddr_ll *sll;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700656 union {
657 struct tpacket_hdr *h1;
658 struct tpacket2_hdr *h2;
659 void *raw;
660 } h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 u8 * skb_head = skb->data;
662 int skb_len = skb->len;
David S. Millerdbcb5852007-01-24 15:21:02 -0800663 unsigned int snaplen, res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700665 unsigned short macoff, netoff, hdrlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 struct sk_buff *copy_skb = NULL;
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700667 struct timeval tv;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700668 struct timespec ts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
670 if (skb->pkt_type == PACKET_LOOPBACK)
671 goto drop;
672
673 sk = pt->af_packet_priv;
674 po = pkt_sk(sk);
675
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900676 if (dev_net(dev) != sock_net(sk))
Denis V. Lunevd12d01d2007-11-19 22:28:35 -0800677 goto drop;
678
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700679 if (dev->header_ops) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 if (sk->sk_type != SOCK_DGRAM)
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -0700681 skb_push(skb, skb->data - skb_mac_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 else if (skb->pkt_type == PACKET_OUTGOING) {
683 /* Special case: outgoing packets have ll header at head */
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -0300684 skb_pull(skb, skb_network_offset(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 }
686 }
687
Herbert Xu8dc41942007-02-04 23:31:32 -0800688 if (skb->ip_summed == CHECKSUM_PARTIAL)
689 status |= TP_STATUS_CSUMNOTREADY;
690
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 snaplen = skb->len;
692
David S. Millerdbcb5852007-01-24 15:21:02 -0800693 res = run_filter(skb, sk, snaplen);
694 if (!res)
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700695 goto drop_n_restore;
David S. Millerdbcb5852007-01-24 15:21:02 -0800696 if (snaplen > res)
697 snaplen = res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
699 if (sk->sk_type == SOCK_DGRAM) {
Patrick McHardy8913336a2008-07-18 18:05:19 -0700700 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
701 po->tp_reserve;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 } else {
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -0300703 unsigned maclen = skb_network_offset(skb);
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700704 netoff = TPACKET_ALIGN(po->tp_hdrlen +
Patrick McHardy8913336a2008-07-18 18:05:19 -0700705 (maclen < 16 ? 16 : maclen)) +
706 po->tp_reserve;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 macoff = netoff - maclen;
708 }
709
Johann Baudy69e3c752009-05-18 22:11:22 -0700710 if (macoff + snaplen > po->rx_ring.frame_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 if (po->copy_thresh &&
712 atomic_read(&sk->sk_rmem_alloc) + skb->truesize <
713 (unsigned)sk->sk_rcvbuf) {
714 if (skb_shared(skb)) {
715 copy_skb = skb_clone(skb, GFP_ATOMIC);
716 } else {
717 copy_skb = skb_get(skb);
718 skb_head = skb->data;
719 }
720 if (copy_skb)
721 skb_set_owner_r(copy_skb, sk);
722 }
Johann Baudy69e3c752009-05-18 22:11:22 -0700723 snaplen = po->rx_ring.frame_size - macoff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 if ((int)snaplen < 0)
725 snaplen = 0;
726 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
728 spin_lock(&sk->sk_receive_queue.lock);
Johann Baudy69e3c752009-05-18 22:11:22 -0700729 h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700730 if (!h.raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 goto ring_is_full;
Johann Baudy69e3c752009-05-18 22:11:22 -0700732 packet_increment_head(&po->rx_ring);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 po->stats.tp_packets++;
734 if (copy_skb) {
735 status |= TP_STATUS_COPY;
736 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
737 }
738 if (!po->stats.tp_drops)
739 status &= ~TP_STATUS_LOSING;
740 spin_unlock(&sk->sk_receive_queue.lock);
741
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700742 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700744 switch (po->tp_version) {
745 case TPACKET_V1:
746 h.h1->tp_len = skb->len;
747 h.h1->tp_snaplen = snaplen;
748 h.h1->tp_mac = macoff;
749 h.h1->tp_net = netoff;
750 if (skb->tstamp.tv64)
751 tv = ktime_to_timeval(skb->tstamp);
752 else
753 do_gettimeofday(&tv);
754 h.h1->tp_sec = tv.tv_sec;
755 h.h1->tp_usec = tv.tv_usec;
756 hdrlen = sizeof(*h.h1);
757 break;
758 case TPACKET_V2:
759 h.h2->tp_len = skb->len;
760 h.h2->tp_snaplen = snaplen;
761 h.h2->tp_mac = macoff;
762 h.h2->tp_net = netoff;
763 if (skb->tstamp.tv64)
764 ts = ktime_to_timespec(skb->tstamp);
765 else
766 getnstimeofday(&ts);
767 h.h2->tp_sec = ts.tv_sec;
768 h.h2->tp_nsec = ts.tv_nsec;
Patrick McHardy393e52e2008-07-14 22:50:39 -0700769 h.h2->tp_vlan_tci = skb->vlan_tci;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700770 hdrlen = sizeof(*h.h2);
771 break;
772 default:
773 BUG();
774 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700776 sll = h.raw + TPACKET_ALIGN(hdrlen);
Stephen Hemmingerb95cce32007-09-26 22:13:38 -0700777 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 sll->sll_family = AF_PACKET;
779 sll->sll_hatype = dev->type;
780 sll->sll_protocol = skb->protocol;
781 sll->sll_pkttype = skb->pkt_type;
Peter P Waskiewicz Jr8032b462007-11-10 22:03:25 -0800782 if (unlikely(po->origdev))
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -0700783 sll->sll_ifindex = orig_dev->ifindex;
784 else
785 sll->sll_ifindex = dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700787 __packet_set_status(po, h.raw, status);
Ralf Baechlee16aa202006-12-07 00:11:33 -0800788 smp_mb();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 {
790 struct page *p_start, *p_end;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700791 u8 *h_end = h.raw + macoff + snaplen - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700793 p_start = virt_to_page(h.raw);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 p_end = virt_to_page(h_end);
795 while (p_start <= p_end) {
796 flush_dcache_page(p_start);
797 p_start++;
798 }
799 }
800
801 sk->sk_data_ready(sk, 0);
802
803drop_n_restore:
804 if (skb_head != skb->data && skb_shared(skb)) {
805 skb->data = skb_head;
806 skb->len = skb_len;
807 }
808drop:
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900809 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 return 0;
811
812ring_is_full:
813 po->stats.tp_drops++;
814 spin_unlock(&sk->sk_receive_queue.lock);
815
816 sk->sk_data_ready(sk, 0);
Wei Yongjunacb5d752009-02-25 00:36:42 +0000817 kfree_skb(copy_skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 goto drop_n_restore;
819}
820
Johann Baudy69e3c752009-05-18 22:11:22 -0700821static void tpacket_destruct_skb(struct sk_buff *skb)
822{
823 struct packet_sock *po = pkt_sk(skb->sk);
824 void * ph;
825
826 BUG_ON(skb == NULL);
827
828 if (likely(po->tx_ring.pg_vec)) {
829 ph = skb_shinfo(skb)->destructor_arg;
830 BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
831 BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
832 atomic_dec(&po->tx_ring.pending);
833 __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
834 }
835
836 sock_wfree(skb);
837}
838
839static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff * skb,
840 void * frame, struct net_device *dev, int size_max,
841 __be16 proto, unsigned char * addr)
842{
843 union {
844 struct tpacket_hdr *h1;
845 struct tpacket2_hdr *h2;
846 void *raw;
847 } ph;
848 int to_write, offset, len, tp_len, nr_frags, len_max;
849 struct socket *sock = po->sk.sk_socket;
850 struct page *page;
851 void *data;
852 int err;
853
854 ph.raw = frame;
855
856 skb->protocol = proto;
857 skb->dev = dev;
858 skb->priority = po->sk.sk_priority;
859 skb_shinfo(skb)->destructor_arg = ph.raw;
860
861 switch (po->tp_version) {
862 case TPACKET_V2:
863 tp_len = ph.h2->tp_len;
864 break;
865 default:
866 tp_len = ph.h1->tp_len;
867 break;
868 }
869 if (unlikely(tp_len > size_max)) {
870 printk(KERN_ERR "packet size is too long (%d > %d)\n",
871 tp_len, size_max);
872 return -EMSGSIZE;
873 }
874
875 skb_reserve(skb, LL_RESERVED_SPACE(dev));
876 skb_reset_network_header(skb);
877
878 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
879 to_write = tp_len;
880
881 if (sock->type == SOCK_DGRAM) {
882 err = dev_hard_header(skb, dev, ntohs(proto), addr,
883 NULL, tp_len);
884 if (unlikely(err < 0))
885 return -EINVAL;
886 } else if (dev->hard_header_len ) {
887 /* net device doesn't like empty head */
888 if (unlikely(tp_len <= dev->hard_header_len)) {
889 printk(KERN_ERR "packet size is too short "
890 "(%d < %d)\n", tp_len,
891 dev->hard_header_len);
892 return -EINVAL;
893 }
894
895 skb_push(skb, dev->hard_header_len);
896 err = skb_store_bits(skb, 0, data,
897 dev->hard_header_len);
898 if (unlikely(err))
899 return err;
900
901 data += dev->hard_header_len;
902 to_write -= dev->hard_header_len;
903 }
904
905 err = -EFAULT;
906 page = virt_to_page(data);
907 offset = offset_in_page(data);
908 len_max = PAGE_SIZE - offset;
909 len = ((to_write > len_max) ? len_max : to_write);
910
911 skb->data_len = to_write;
912 skb->len += to_write;
913 skb->truesize += to_write;
914 atomic_add(to_write, &po->sk.sk_wmem_alloc);
915
916 while (likely(to_write)) {
917 nr_frags = skb_shinfo(skb)->nr_frags;
918
919 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
920 printk(KERN_ERR "Packet exceed the number "
921 "of skb frags(%lu)\n",
922 MAX_SKB_FRAGS);
923 return -EFAULT;
924 }
925
926 flush_dcache_page(page);
927 get_page(page);
928 skb_fill_page_desc(skb,
929 nr_frags,
930 page++, offset, len);
931 to_write -= len;
932 offset = 0;
933 len_max = PAGE_SIZE;
934 len = ((to_write > len_max) ? len_max : to_write);
935 }
936
937 return tp_len;
938}
939
940static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
941{
942 struct socket *sock;
943 struct sk_buff *skb;
944 struct net_device *dev;
945 __be16 proto;
946 int ifindex, err, reserve = 0;
947 void * ph;
948 struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name;
949 int tp_len, size_max;
950 unsigned char *addr;
951 int len_sum = 0;
952 int status = 0;
953
954 sock = po->sk.sk_socket;
955
956 mutex_lock(&po->pg_vec_lock);
957
958 err = -EBUSY;
959 if (saddr == NULL) {
960 ifindex = po->ifindex;
961 proto = po->num;
962 addr = NULL;
963 } else {
964 err = -EINVAL;
965 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
966 goto out;
967 if (msg->msg_namelen < (saddr->sll_halen
968 + offsetof(struct sockaddr_ll,
969 sll_addr)))
970 goto out;
971 ifindex = saddr->sll_ifindex;
972 proto = saddr->sll_protocol;
973 addr = saddr->sll_addr;
974 }
975
976 dev = dev_get_by_index(sock_net(&po->sk), ifindex);
977 err = -ENXIO;
978 if (unlikely(dev == NULL))
979 goto out;
980
981 reserve = dev->hard_header_len;
982
983 err = -ENETDOWN;
984 if (unlikely(!(dev->flags & IFF_UP)))
985 goto out_put;
986
987 size_max = po->tx_ring.frame_size
988 - sizeof(struct skb_shared_info)
989 - po->tp_hdrlen
990 - LL_ALLOCATED_SPACE(dev)
991 - sizeof(struct sockaddr_ll);
992
993 if (size_max > dev->mtu + reserve)
994 size_max = dev->mtu + reserve;
995
996 do {
997 ph = packet_current_frame(po, &po->tx_ring,
998 TP_STATUS_SEND_REQUEST);
999
1000 if (unlikely(ph == NULL)) {
1001 schedule();
1002 continue;
1003 }
1004
1005 status = TP_STATUS_SEND_REQUEST;
1006 skb = sock_alloc_send_skb(&po->sk,
1007 LL_ALLOCATED_SPACE(dev)
1008 + sizeof(struct sockaddr_ll),
1009 0, &err);
1010
1011 if (unlikely(skb == NULL))
1012 goto out_status;
1013
1014 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
1015 addr);
1016
1017 if (unlikely(tp_len < 0)) {
1018 if (po->tp_loss) {
1019 __packet_set_status(po, ph,
1020 TP_STATUS_AVAILABLE);
1021 packet_increment_head(&po->tx_ring);
1022 kfree_skb(skb);
1023 continue;
1024 } else {
1025 status = TP_STATUS_WRONG_FORMAT;
1026 err = tp_len;
1027 goto out_status;
1028 }
1029 }
1030
1031 skb->destructor = tpacket_destruct_skb;
1032 __packet_set_status(po, ph, TP_STATUS_SENDING);
1033 atomic_inc(&po->tx_ring.pending);
1034
1035 status = TP_STATUS_SEND_REQUEST;
1036 err = dev_queue_xmit(skb);
1037 if (unlikely(err > 0 && (err = net_xmit_errno(err)) != 0))
1038 goto out_xmit;
1039 packet_increment_head(&po->tx_ring);
1040 len_sum += tp_len;
1041 }
1042 while (likely((ph != NULL) || ((!(msg->msg_flags & MSG_DONTWAIT))
1043 && (atomic_read(&po->tx_ring.pending))))
1044 );
1045
1046 err = len_sum;
1047 goto out_put;
1048
1049out_xmit:
1050 skb->destructor = sock_wfree;
1051 atomic_dec(&po->tx_ring.pending);
1052out_status:
1053 __packet_set_status(po, ph, status);
1054 kfree_skb(skb);
1055out_put:
1056 dev_put(dev);
1057out:
1058 mutex_unlock(&po->pg_vec_lock);
1059 return err;
1060}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061#endif
1062
Johann Baudy69e3c752009-05-18 22:11:22 -07001063static int packet_snd(struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 struct msghdr *msg, size_t len)
1065{
1066 struct sock *sk = sock->sk;
1067 struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name;
1068 struct sk_buff *skb;
1069 struct net_device *dev;
Al Viro0e11c912006-11-08 00:26:29 -08001070 __be16 proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 unsigned char *addr;
1072 int ifindex, err, reserve = 0;
1073
1074 /*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001075 * Get and verify the address.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001077
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 if (saddr == NULL) {
1079 struct packet_sock *po = pkt_sk(sk);
1080
1081 ifindex = po->ifindex;
1082 proto = po->num;
1083 addr = NULL;
1084 } else {
1085 err = -EINVAL;
1086 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
1087 goto out;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001088 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
1089 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 ifindex = saddr->sll_ifindex;
1091 proto = saddr->sll_protocol;
1092 addr = saddr->sll_addr;
1093 }
1094
1095
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001096 dev = dev_get_by_index(sock_net(sk), ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 err = -ENXIO;
1098 if (dev == NULL)
1099 goto out_unlock;
1100 if (sock->type == SOCK_RAW)
1101 reserve = dev->hard_header_len;
1102
David S. Millerd5e76b02007-01-25 19:30:36 -08001103 err = -ENETDOWN;
1104 if (!(dev->flags & IFF_UP))
1105 goto out_unlock;
1106
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 err = -EMSGSIZE;
1108 if (len > dev->mtu+reserve)
1109 goto out_unlock;
1110
Johannes Bergf5184d22008-05-12 20:48:31 -07001111 skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 msg->msg_flags & MSG_DONTWAIT, &err);
1113 if (skb==NULL)
1114 goto out_unlock;
1115
1116 skb_reserve(skb, LL_RESERVED_SPACE(dev));
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -07001117 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118
Stephen Hemminger0c4e8582007-10-09 01:36:32 -07001119 err = -EINVAL;
1120 if (sock->type == SOCK_DGRAM &&
1121 dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0)
1122 goto out_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123
1124 /* Returns -EFAULT on error */
1125 err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
1126 if (err)
1127 goto out_free;
1128
1129 skb->protocol = proto;
1130 skb->dev = dev;
1131 skb->priority = sk->sk_priority;
1132
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 /*
1134 * Now send it
1135 */
1136
1137 err = dev_queue_xmit(skb);
1138 if (err > 0 && (err = net_xmit_errno(err)) != 0)
1139 goto out_unlock;
1140
1141 dev_put(dev);
1142
1143 return(len);
1144
1145out_free:
1146 kfree_skb(skb);
1147out_unlock:
1148 if (dev)
1149 dev_put(dev);
1150out:
1151 return err;
1152}
1153
Johann Baudy69e3c752009-05-18 22:11:22 -07001154static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
1155 struct msghdr *msg, size_t len)
1156{
1157#ifdef CONFIG_PACKET_MMAP
1158 struct sock *sk = sock->sk;
1159 struct packet_sock *po = pkt_sk(sk);
1160 if (po->tx_ring.pg_vec)
1161 return tpacket_snd(po, msg);
1162 else
1163#endif
1164 return packet_snd(sock, msg, len);
1165}
1166
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167/*
1168 * Close a PACKET socket. This is fairly simple. We immediately go
1169 * to 'closed' state and remove our protocol entry in the device list.
1170 */
1171
1172static int packet_release(struct socket *sock)
1173{
1174 struct sock *sk = sock->sk;
1175 struct packet_sock *po;
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08001176 struct net *net;
Johann Baudy69e3c752009-05-18 22:11:22 -07001177#ifdef CONFIG_PACKET_MMAP
1178 struct tpacket_req req;
1179#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180
1181 if (!sk)
1182 return 0;
1183
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001184 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 po = pkt_sk(sk);
1186
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08001187 write_lock_bh(&net->packet.sklist_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 sk_del_node_init(sk);
Eric Dumazet920de802008-11-24 00:09:29 -08001189 sock_prot_inuse_add(net, sk->sk_prot, -1);
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08001190 write_unlock_bh(&net->packet.sklist_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191
1192 /*
1193 * Unhook packet receive handler.
1194 */
1195
1196 if (po->running) {
1197 /*
1198 * Remove the protocol hook
1199 */
1200 dev_remove_pack(&po->prot_hook);
1201 po->running = 0;
1202 po->num = 0;
1203 __sock_put(sk);
1204 }
1205
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 packet_flush_mclist(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
1208#ifdef CONFIG_PACKET_MMAP
Johann Baudy69e3c752009-05-18 22:11:22 -07001209 memset(&req, 0, sizeof(req));
1210
1211 if (po->rx_ring.pg_vec)
1212 packet_set_ring(sk, &req, 1, 0);
1213
1214 if (po->tx_ring.pg_vec)
1215 packet_set_ring(sk, &req, 1, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216#endif
1217
1218 /*
1219 * Now the socket is dead. No more input will appear.
1220 */
1221
1222 sock_orphan(sk);
1223 sock->sk = NULL;
1224
1225 /* Purge queues */
1226
1227 skb_queue_purge(&sk->sk_receive_queue);
Pavel Emelyanov17ab56a2007-11-10 21:38:48 -08001228 sk_refcnt_debug_release(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229
1230 sock_put(sk);
1231 return 0;
1232}
1233
1234/*
1235 * Attach a packet hook.
1236 */
1237
Al Viro0e11c912006-11-08 00:26:29 -08001238static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239{
1240 struct packet_sock *po = pkt_sk(sk);
1241 /*
1242 * Detach an existing hook if present.
1243 */
1244
1245 lock_sock(sk);
1246
1247 spin_lock(&po->bind_lock);
1248 if (po->running) {
1249 __sock_put(sk);
1250 po->running = 0;
1251 po->num = 0;
1252 spin_unlock(&po->bind_lock);
1253 dev_remove_pack(&po->prot_hook);
1254 spin_lock(&po->bind_lock);
1255 }
1256
1257 po->num = protocol;
1258 po->prot_hook.type = protocol;
1259 po->prot_hook.dev = dev;
1260
1261 po->ifindex = dev ? dev->ifindex : 0;
1262
1263 if (protocol == 0)
1264 goto out_unlock;
1265
Urs Thuermannbe85d4a2007-11-12 21:05:20 -08001266 if (!dev || (dev->flags & IFF_UP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 dev_add_pack(&po->prot_hook);
1268 sock_hold(sk);
1269 po->running = 1;
Urs Thuermannbe85d4a2007-11-12 21:05:20 -08001270 } else {
1271 sk->sk_err = ENETDOWN;
1272 if (!sock_flag(sk, SOCK_DEAD))
1273 sk->sk_error_report(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 }
1275
1276out_unlock:
1277 spin_unlock(&po->bind_lock);
1278 release_sock(sk);
1279 return 0;
1280}
1281
1282/*
1283 * Bind a packet socket to a device
1284 */
1285
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1287{
1288 struct sock *sk=sock->sk;
1289 char name[15];
1290 struct net_device *dev;
1291 int err = -ENODEV;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001292
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 /*
1294 * Check legality
1295 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001296
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08001297 if (addr_len != sizeof(struct sockaddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 return -EINVAL;
1299 strlcpy(name,uaddr->sa_data,sizeof(name));
1300
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001301 dev = dev_get_by_name(sock_net(sk), name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 if (dev) {
1303 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1304 dev_put(dev);
1305 }
1306 return err;
1307}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308
1309static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1310{
1311 struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr;
1312 struct sock *sk=sock->sk;
1313 struct net_device *dev = NULL;
1314 int err;
1315
1316
1317 /*
1318 * Check legality
1319 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001320
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 if (addr_len < sizeof(struct sockaddr_ll))
1322 return -EINVAL;
1323 if (sll->sll_family != AF_PACKET)
1324 return -EINVAL;
1325
1326 if (sll->sll_ifindex) {
1327 err = -ENODEV;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001328 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 if (dev == NULL)
1330 goto out;
1331 }
1332 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1333 if (dev)
1334 dev_put(dev);
1335
1336out:
1337 return err;
1338}
1339
1340static struct proto packet_proto = {
1341 .name = "PACKET",
1342 .owner = THIS_MODULE,
1343 .obj_size = sizeof(struct packet_sock),
1344};
1345
1346/*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001347 * Create a packet of type SOCK_PACKET.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 */
1349
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001350static int packet_create(struct net *net, struct socket *sock, int protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351{
1352 struct sock *sk;
1353 struct packet_sock *po;
Al Viro0e11c912006-11-08 00:26:29 -08001354 __be16 proto = (__force __be16)protocol; /* weird, but documented */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 int err;
1356
1357 if (!capable(CAP_NET_RAW))
1358 return -EPERM;
David S. Millerbe020972007-05-29 13:16:31 -07001359 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
1360 sock->type != SOCK_PACKET)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 return -ESOCKTNOSUPPORT;
1362
1363 sock->state = SS_UNCONNECTED;
1364
1365 err = -ENOBUFS;
Pavel Emelyanov6257ff22007-11-01 00:39:31 -07001366 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 if (sk == NULL)
1368 goto out;
1369
1370 sock->ops = &packet_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 if (sock->type == SOCK_PACKET)
1372 sock->ops = &packet_ops_spkt;
David S. Millerbe020972007-05-29 13:16:31 -07001373
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 sock_init_data(sock, sk);
1375
1376 po = pkt_sk(sk);
1377 sk->sk_family = PF_PACKET;
Al Viro0e11c912006-11-08 00:26:29 -08001378 po->num = proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379
1380 sk->sk_destruct = packet_sock_destruct;
Pavel Emelyanov17ab56a2007-11-10 21:38:48 -08001381 sk_refcnt_debug_inc(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382
1383 /*
1384 * Attach a protocol block
1385 */
1386
1387 spin_lock_init(&po->bind_lock);
Herbert Xu905db442009-01-30 14:12:06 -08001388 mutex_init(&po->pg_vec_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 po->prot_hook.func = packet_rcv;
David S. Millerbe020972007-05-29 13:16:31 -07001390
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 if (sock->type == SOCK_PACKET)
1392 po->prot_hook.func = packet_rcv_spkt;
David S. Millerbe020972007-05-29 13:16:31 -07001393
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 po->prot_hook.af_packet_priv = sk;
1395
Al Viro0e11c912006-11-08 00:26:29 -08001396 if (proto) {
1397 po->prot_hook.type = proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 dev_add_pack(&po->prot_hook);
1399 sock_hold(sk);
1400 po->running = 1;
1401 }
1402
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08001403 write_lock_bh(&net->packet.sklist_lock);
1404 sk_add_node(sk, &net->packet.sklist);
Eric Dumazet36804532008-11-19 14:25:35 -08001405 sock_prot_inuse_add(net, &packet_proto, 1);
Eric Dumazet920de802008-11-24 00:09:29 -08001406 write_unlock_bh(&net->packet.sklist_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 return(0);
1408out:
1409 return err;
1410}
1411
1412/*
1413 * Pull a packet from our receive queue and hand it to the user.
1414 * If necessary we block.
1415 */
1416
1417static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1418 struct msghdr *msg, size_t len, int flags)
1419{
1420 struct sock *sk = sock->sk;
1421 struct sk_buff *skb;
1422 int copied, err;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001423 struct sockaddr_ll *sll;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
1425 err = -EINVAL;
1426 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
1427 goto out;
1428
1429#if 0
1430 /* What error should we return now? EUNATTACH? */
1431 if (pkt_sk(sk)->ifindex < 0)
1432 return -ENODEV;
1433#endif
1434
1435 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 * Call the generic datagram receiver. This handles all sorts
1437 * of horrible races and re-entrancy so we can forget about it
1438 * in the protocol layers.
1439 *
1440 * Now it will return ENETDOWN, if device have just gone down,
1441 * but then it will block.
1442 */
1443
1444 skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err);
1445
1446 /*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001447 * An error occurred so return it. Because skb_recv_datagram()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 * handles the blocking we don't see and worry about blocking
1449 * retries.
1450 */
1451
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08001452 if (skb == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 goto out;
1454
1455 /*
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001456 * If the address length field is there to be filled in, we fill
1457 * it in now.
1458 */
1459
Herbert Xuffbc6112007-02-04 23:33:10 -08001460 sll = &PACKET_SKB_CB(skb)->sa.ll;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001461 if (sock->type == SOCK_PACKET)
1462 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1463 else
1464 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1465
1466 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 * You lose any data beyond the buffer you gave. If it worries a
1468 * user program they can ask the device for its MTU anyway.
1469 */
1470
1471 copied = skb->len;
1472 if (copied > len)
1473 {
1474 copied=len;
1475 msg->msg_flags|=MSG_TRUNC;
1476 }
1477
1478 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1479 if (err)
1480 goto out_free;
1481
1482 sock_recv_timestamp(msg, sk, skb);
1483
1484 if (msg->msg_name)
Herbert Xuffbc6112007-02-04 23:33:10 -08001485 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
1486 msg->msg_namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487
Herbert Xu8dc41942007-02-04 23:31:32 -08001488 if (pkt_sk(sk)->auxdata) {
Herbert Xuffbc6112007-02-04 23:33:10 -08001489 struct tpacket_auxdata aux;
1490
1491 aux.tp_status = TP_STATUS_USER;
1492 if (skb->ip_summed == CHECKSUM_PARTIAL)
1493 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
1494 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
1495 aux.tp_snaplen = skb->len;
1496 aux.tp_mac = 0;
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -03001497 aux.tp_net = skb_network_offset(skb);
Patrick McHardy393e52e2008-07-14 22:50:39 -07001498 aux.tp_vlan_tci = skb->vlan_tci;
Herbert Xuffbc6112007-02-04 23:33:10 -08001499
1500 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
Herbert Xu8dc41942007-02-04 23:31:32 -08001501 }
1502
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 /*
1504 * Free or return the buffer as appropriate. Again this
1505 * hides all the races and re-entrancy issues from us.
1506 */
1507 err = (flags&MSG_TRUNC) ? skb->len : copied;
1508
1509out_free:
1510 skb_free_datagram(sk, skb);
1511out:
1512 return err;
1513}
1514
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
1516 int *uaddr_len, int peer)
1517{
1518 struct net_device *dev;
1519 struct sock *sk = sock->sk;
1520
1521 if (peer)
1522 return -EOPNOTSUPP;
1523
1524 uaddr->sa_family = AF_PACKET;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001525 dev = dev_get_by_index(sock_net(sk), pkt_sk(sk)->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 if (dev) {
1527 strlcpy(uaddr->sa_data, dev->name, 15);
1528 dev_put(dev);
1529 } else
1530 memset(uaddr->sa_data, 0, 14);
1531 *uaddr_len = sizeof(*uaddr);
1532
1533 return 0;
1534}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535
1536static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
1537 int *uaddr_len, int peer)
1538{
1539 struct net_device *dev;
1540 struct sock *sk = sock->sk;
1541 struct packet_sock *po = pkt_sk(sk);
1542 struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr;
1543
1544 if (peer)
1545 return -EOPNOTSUPP;
1546
1547 sll->sll_family = AF_PACKET;
1548 sll->sll_ifindex = po->ifindex;
1549 sll->sll_protocol = po->num;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001550 dev = dev_get_by_index(sock_net(sk), po->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551 if (dev) {
1552 sll->sll_hatype = dev->type;
1553 sll->sll_halen = dev->addr_len;
1554 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1555 dev_put(dev);
1556 } else {
1557 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
1558 sll->sll_halen = 0;
1559 }
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001560 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561
1562 return 0;
1563}
1564
Wang Chen2aeb0b82008-07-14 20:49:46 -07001565static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
1566 int what)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567{
1568 switch (i->type) {
1569 case PACKET_MR_MULTICAST:
1570 if (what > 0)
Eric W. Biedermand95ed922009-05-19 18:27:17 +00001571 return dev_mc_add(dev, i->addr, i->alen, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572 else
Eric W. Biedermand95ed922009-05-19 18:27:17 +00001573 return dev_mc_delete(dev, i->addr, i->alen, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574 break;
1575 case PACKET_MR_PROMISC:
Wang Chen2aeb0b82008-07-14 20:49:46 -07001576 return dev_set_promiscuity(dev, what);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 break;
1578 case PACKET_MR_ALLMULTI:
Wang Chen2aeb0b82008-07-14 20:49:46 -07001579 return dev_set_allmulti(dev, what);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580 break;
Eric W. Biedermand95ed922009-05-19 18:27:17 +00001581 case PACKET_MR_UNICAST:
1582 if (what > 0)
Jiri Pirkoccffad252009-05-22 23:22:17 +00001583 return dev_unicast_add(dev, i->addr);
Eric W. Biedermand95ed922009-05-19 18:27:17 +00001584 else
Jiri Pirkoccffad252009-05-22 23:22:17 +00001585 return dev_unicast_delete(dev, i->addr);
Eric W. Biedermand95ed922009-05-19 18:27:17 +00001586 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 default:;
1588 }
Wang Chen2aeb0b82008-07-14 20:49:46 -07001589 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590}
1591
1592static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
1593{
1594 for ( ; i; i=i->next) {
1595 if (i->ifindex == dev->ifindex)
1596 packet_dev_mc(dev, i, what);
1597 }
1598}
1599
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001600static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601{
1602 struct packet_sock *po = pkt_sk(sk);
1603 struct packet_mclist *ml, *i;
1604 struct net_device *dev;
1605 int err;
1606
1607 rtnl_lock();
1608
1609 err = -ENODEV;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001610 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611 if (!dev)
1612 goto done;
1613
1614 err = -EINVAL;
1615 if (mreq->mr_alen > dev->addr_len)
1616 goto done;
1617
1618 err = -ENOBUFS;
Kris Katterjohn8b3a7002006-01-11 15:56:43 -08001619 i = kmalloc(sizeof(*i), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 if (i == NULL)
1621 goto done;
1622
1623 err = 0;
1624 for (ml = po->mclist; ml; ml = ml->next) {
1625 if (ml->ifindex == mreq->mr_ifindex &&
1626 ml->type == mreq->mr_type &&
1627 ml->alen == mreq->mr_alen &&
1628 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1629 ml->count++;
1630 /* Free the new element ... */
1631 kfree(i);
1632 goto done;
1633 }
1634 }
1635
1636 i->type = mreq->mr_type;
1637 i->ifindex = mreq->mr_ifindex;
1638 i->alen = mreq->mr_alen;
1639 memcpy(i->addr, mreq->mr_address, i->alen);
1640 i->count = 1;
1641 i->next = po->mclist;
1642 po->mclist = i;
Wang Chen2aeb0b82008-07-14 20:49:46 -07001643 err = packet_dev_mc(dev, i, 1);
1644 if (err) {
1645 po->mclist = i->next;
1646 kfree(i);
1647 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648
1649done:
1650 rtnl_unlock();
1651 return err;
1652}
1653
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001654static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655{
1656 struct packet_mclist *ml, **mlp;
1657
1658 rtnl_lock();
1659
1660 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
1661 if (ml->ifindex == mreq->mr_ifindex &&
1662 ml->type == mreq->mr_type &&
1663 ml->alen == mreq->mr_alen &&
1664 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1665 if (--ml->count == 0) {
1666 struct net_device *dev;
1667 *mlp = ml->next;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001668 dev = dev_get_by_index(sock_net(sk), ml->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 if (dev) {
1670 packet_dev_mc(dev, ml, -1);
1671 dev_put(dev);
1672 }
1673 kfree(ml);
1674 }
1675 rtnl_unlock();
1676 return 0;
1677 }
1678 }
1679 rtnl_unlock();
1680 return -EADDRNOTAVAIL;
1681}
1682
1683static void packet_flush_mclist(struct sock *sk)
1684{
1685 struct packet_sock *po = pkt_sk(sk);
1686 struct packet_mclist *ml;
1687
1688 if (!po->mclist)
1689 return;
1690
1691 rtnl_lock();
1692 while ((ml = po->mclist) != NULL) {
1693 struct net_device *dev;
1694
1695 po->mclist = ml->next;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001696 if ((dev = dev_get_by_index(sock_net(sk), ml->ifindex)) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 packet_dev_mc(dev, ml, -1);
1698 dev_put(dev);
1699 }
1700 kfree(ml);
1701 }
1702 rtnl_unlock();
1703}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704
1705static int
1706packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1707{
1708 struct sock *sk = sock->sk;
Herbert Xu8dc41942007-02-04 23:31:32 -08001709 struct packet_sock *po = pkt_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710 int ret;
1711
1712 if (level != SOL_PACKET)
1713 return -ENOPROTOOPT;
1714
Johann Baudy69e3c752009-05-18 22:11:22 -07001715 switch (optname) {
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001716 case PACKET_ADD_MEMBERSHIP:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717 case PACKET_DROP_MEMBERSHIP:
1718 {
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001719 struct packet_mreq_max mreq;
1720 int len = optlen;
1721 memset(&mreq, 0, sizeof(mreq));
1722 if (len < sizeof(struct packet_mreq))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 return -EINVAL;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001724 if (len > sizeof(mreq))
1725 len = sizeof(mreq);
1726 if (copy_from_user(&mreq,optval,len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727 return -EFAULT;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001728 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
1729 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 if (optname == PACKET_ADD_MEMBERSHIP)
1731 ret = packet_mc_add(sk, &mreq);
1732 else
1733 ret = packet_mc_drop(sk, &mreq);
1734 return ret;
1735 }
David S. Millera2efcfa2007-05-29 13:12:50 -07001736
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737#ifdef CONFIG_PACKET_MMAP
1738 case PACKET_RX_RING:
Johann Baudy69e3c752009-05-18 22:11:22 -07001739 case PACKET_TX_RING:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740 {
1741 struct tpacket_req req;
1742
1743 if (optlen<sizeof(req))
1744 return -EINVAL;
1745 if (copy_from_user(&req,optval,sizeof(req)))
1746 return -EFAULT;
Johann Baudy69e3c752009-05-18 22:11:22 -07001747 return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748 }
1749 case PACKET_COPY_THRESH:
1750 {
1751 int val;
1752
1753 if (optlen!=sizeof(val))
1754 return -EINVAL;
1755 if (copy_from_user(&val,optval,sizeof(val)))
1756 return -EFAULT;
1757
1758 pkt_sk(sk)->copy_thresh = val;
1759 return 0;
1760 }
Patrick McHardybbd6ef82008-07-14 22:50:15 -07001761 case PACKET_VERSION:
1762 {
1763 int val;
1764
1765 if (optlen != sizeof(val))
1766 return -EINVAL;
Johann Baudy69e3c752009-05-18 22:11:22 -07001767 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
Patrick McHardybbd6ef82008-07-14 22:50:15 -07001768 return -EBUSY;
1769 if (copy_from_user(&val, optval, sizeof(val)))
1770 return -EFAULT;
1771 switch (val) {
1772 case TPACKET_V1:
1773 case TPACKET_V2:
1774 po->tp_version = val;
1775 return 0;
1776 default:
1777 return -EINVAL;
1778 }
1779 }
Patrick McHardy8913336a2008-07-18 18:05:19 -07001780 case PACKET_RESERVE:
1781 {
1782 unsigned int val;
1783
1784 if (optlen != sizeof(val))
1785 return -EINVAL;
Johann Baudy69e3c752009-05-18 22:11:22 -07001786 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
Patrick McHardy8913336a2008-07-18 18:05:19 -07001787 return -EBUSY;
1788 if (copy_from_user(&val, optval, sizeof(val)))
1789 return -EFAULT;
1790 po->tp_reserve = val;
1791 return 0;
1792 }
Johann Baudy69e3c752009-05-18 22:11:22 -07001793 case PACKET_LOSS:
1794 {
1795 unsigned int val;
1796
1797 if (optlen != sizeof(val))
1798 return -EINVAL;
1799 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1800 return -EBUSY;
1801 if (copy_from_user(&val, optval, sizeof(val)))
1802 return -EFAULT;
1803 po->tp_loss = !!val;
1804 return 0;
1805 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806#endif
Herbert Xu8dc41942007-02-04 23:31:32 -08001807 case PACKET_AUXDATA:
1808 {
1809 int val;
1810
1811 if (optlen < sizeof(val))
1812 return -EINVAL;
1813 if (copy_from_user(&val, optval, sizeof(val)))
1814 return -EFAULT;
1815
1816 po->auxdata = !!val;
1817 return 0;
1818 }
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -07001819 case PACKET_ORIGDEV:
1820 {
1821 int val;
1822
1823 if (optlen < sizeof(val))
1824 return -EINVAL;
1825 if (copy_from_user(&val, optval, sizeof(val)))
1826 return -EFAULT;
1827
1828 po->origdev = !!val;
1829 return 0;
1830 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831 default:
1832 return -ENOPROTOOPT;
1833 }
1834}
1835
1836static int packet_getsockopt(struct socket *sock, int level, int optname,
1837 char __user *optval, int __user *optlen)
1838{
1839 int len;
Herbert Xu8dc41942007-02-04 23:31:32 -08001840 int val;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841 struct sock *sk = sock->sk;
1842 struct packet_sock *po = pkt_sk(sk);
Herbert Xu8dc41942007-02-04 23:31:32 -08001843 void *data;
1844 struct tpacket_stats st;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001845
1846 if (level != SOL_PACKET)
1847 return -ENOPROTOOPT;
1848
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08001849 if (get_user(len, optlen))
1850 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851
1852 if (len < 0)
1853 return -EINVAL;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001854
Johann Baudy69e3c752009-05-18 22:11:22 -07001855 switch (optname) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856 case PACKET_STATISTICS:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857 if (len > sizeof(struct tpacket_stats))
1858 len = sizeof(struct tpacket_stats);
1859 spin_lock_bh(&sk->sk_receive_queue.lock);
1860 st = po->stats;
1861 memset(&po->stats, 0, sizeof(st));
1862 spin_unlock_bh(&sk->sk_receive_queue.lock);
1863 st.tp_packets += st.tp_drops;
1864
Herbert Xu8dc41942007-02-04 23:31:32 -08001865 data = &st;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866 break;
Herbert Xu8dc41942007-02-04 23:31:32 -08001867 case PACKET_AUXDATA:
1868 if (len > sizeof(int))
1869 len = sizeof(int);
1870 val = po->auxdata;
1871
1872 data = &val;
1873 break;
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -07001874 case PACKET_ORIGDEV:
1875 if (len > sizeof(int))
1876 len = sizeof(int);
1877 val = po->origdev;
1878
1879 data = &val;
1880 break;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07001881#ifdef CONFIG_PACKET_MMAP
1882 case PACKET_VERSION:
1883 if (len > sizeof(int))
1884 len = sizeof(int);
1885 val = po->tp_version;
1886 data = &val;
1887 break;
1888 case PACKET_HDRLEN:
1889 if (len > sizeof(int))
1890 len = sizeof(int);
1891 if (copy_from_user(&val, optval, len))
1892 return -EFAULT;
1893 switch (val) {
1894 case TPACKET_V1:
1895 val = sizeof(struct tpacket_hdr);
1896 break;
1897 case TPACKET_V2:
1898 val = sizeof(struct tpacket2_hdr);
1899 break;
1900 default:
1901 return -EINVAL;
1902 }
1903 data = &val;
1904 break;
Patrick McHardy8913336a2008-07-18 18:05:19 -07001905 case PACKET_RESERVE:
1906 if (len > sizeof(unsigned int))
1907 len = sizeof(unsigned int);
1908 val = po->tp_reserve;
1909 data = &val;
1910 break;
Johann Baudy69e3c752009-05-18 22:11:22 -07001911 case PACKET_LOSS:
1912 if (len > sizeof(unsigned int))
1913 len = sizeof(unsigned int);
1914 val = po->tp_loss;
1915 data = &val;
1916 break;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07001917#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 default:
1919 return -ENOPROTOOPT;
1920 }
1921
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08001922 if (put_user(len, optlen))
1923 return -EFAULT;
Herbert Xu8dc41942007-02-04 23:31:32 -08001924 if (copy_to_user(optval, data, len))
1925 return -EFAULT;
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08001926 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927}
1928
1929
1930static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
1931{
1932 struct sock *sk;
1933 struct hlist_node *node;
Jason Lunzad930652007-02-20 23:19:54 -08001934 struct net_device *dev = data;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001935 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08001937 read_lock(&net->packet.sklist_lock);
1938 sk_for_each(sk, node, &net->packet.sklist) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939 struct packet_sock *po = pkt_sk(sk);
1940
1941 switch (msg) {
1942 case NETDEV_UNREGISTER:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943 if (po->mclist)
1944 packet_dev_mclist(dev, po->mclist, -1);
David S. Millera2efcfa2007-05-29 13:12:50 -07001945 /* fallthrough */
1946
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947 case NETDEV_DOWN:
1948 if (dev->ifindex == po->ifindex) {
1949 spin_lock(&po->bind_lock);
1950 if (po->running) {
1951 __dev_remove_pack(&po->prot_hook);
1952 __sock_put(sk);
1953 po->running = 0;
1954 sk->sk_err = ENETDOWN;
1955 if (!sock_flag(sk, SOCK_DEAD))
1956 sk->sk_error_report(sk);
1957 }
1958 if (msg == NETDEV_UNREGISTER) {
1959 po->ifindex = -1;
1960 po->prot_hook.dev = NULL;
1961 }
1962 spin_unlock(&po->bind_lock);
1963 }
1964 break;
1965 case NETDEV_UP:
1966 spin_lock(&po->bind_lock);
1967 if (dev->ifindex == po->ifindex && po->num &&
1968 !po->running) {
1969 dev_add_pack(&po->prot_hook);
1970 sock_hold(sk);
1971 po->running = 1;
1972 }
1973 spin_unlock(&po->bind_lock);
1974 break;
1975 }
1976 }
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08001977 read_unlock(&net->packet.sklist_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978 return NOTIFY_DONE;
1979}
1980
1981
1982static int packet_ioctl(struct socket *sock, unsigned int cmd,
1983 unsigned long arg)
1984{
1985 struct sock *sk = sock->sk;
1986
Johann Baudy69e3c752009-05-18 22:11:22 -07001987 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988 case SIOCOUTQ:
1989 {
Eric Dumazet31e6d362009-06-17 19:05:41 -07001990 int amount = sk_wmem_alloc_get(sk);
1991
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992 return put_user(amount, (int __user *)arg);
1993 }
1994 case SIOCINQ:
1995 {
1996 struct sk_buff *skb;
1997 int amount = 0;
1998
1999 spin_lock_bh(&sk->sk_receive_queue.lock);
2000 skb = skb_peek(&sk->sk_receive_queue);
2001 if (skb)
2002 amount = skb->len;
2003 spin_unlock_bh(&sk->sk_receive_queue.lock);
2004 return put_user(amount, (int __user *)arg);
2005 }
2006 case SIOCGSTAMP:
2007 return sock_get_timestamp(sk, (struct timeval __user *)arg);
Eric Dumazetae40eb12007-03-18 17:33:16 -07002008 case SIOCGSTAMPNS:
2009 return sock_get_timestampns(sk, (struct timespec __user *)arg);
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002010
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011#ifdef CONFIG_INET
2012 case SIOCADDRT:
2013 case SIOCDELRT:
2014 case SIOCDARP:
2015 case SIOCGARP:
2016 case SIOCSARP:
2017 case SIOCGIFADDR:
2018 case SIOCSIFADDR:
2019 case SIOCGIFBRDADDR:
2020 case SIOCSIFBRDADDR:
2021 case SIOCGIFNETMASK:
2022 case SIOCSIFNETMASK:
2023 case SIOCGIFDSTADDR:
2024 case SIOCSIFDSTADDR:
2025 case SIOCSIFFLAGS:
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -07002026 if (!net_eq(sock_net(sk), &init_net))
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002027 return -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028 return inet_dgram_ops.ioctl(sock, cmd, arg);
2029#endif
2030
2031 default:
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -08002032 return -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002033 }
2034 return 0;
2035}
2036
2037#ifndef CONFIG_PACKET_MMAP
2038#define packet_mmap sock_no_mmap
2039#define packet_poll datagram_poll
2040#else
2041
2042static unsigned int packet_poll(struct file * file, struct socket *sock,
2043 poll_table *wait)
2044{
2045 struct sock *sk = sock->sk;
2046 struct packet_sock *po = pkt_sk(sk);
2047 unsigned int mask = datagram_poll(file, sock, wait);
2048
2049 spin_lock_bh(&sk->sk_receive_queue.lock);
Johann Baudy69e3c752009-05-18 22:11:22 -07002050 if (po->rx_ring.pg_vec) {
2051 if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052 mask |= POLLIN | POLLRDNORM;
2053 }
2054 spin_unlock_bh(&sk->sk_receive_queue.lock);
Johann Baudy69e3c752009-05-18 22:11:22 -07002055 spin_lock_bh(&sk->sk_write_queue.lock);
2056 if (po->tx_ring.pg_vec) {
2057 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
2058 mask |= POLLOUT | POLLWRNORM;
2059 }
2060 spin_unlock_bh(&sk->sk_write_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061 return mask;
2062}
2063
2064
2065/* Dirty? Well, I still did not learn better way to account
2066 * for user mmaps.
2067 */
2068
2069static void packet_mm_open(struct vm_area_struct *vma)
2070{
2071 struct file *file = vma->vm_file;
Eric Dumazetb69aee02005-09-06 14:42:45 -07002072 struct socket * sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073 struct sock *sk = sock->sk;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002074
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075 if (sk)
2076 atomic_inc(&pkt_sk(sk)->mapped);
2077}
2078
2079static void packet_mm_close(struct vm_area_struct *vma)
2080{
2081 struct file *file = vma->vm_file;
Eric Dumazetb69aee02005-09-06 14:42:45 -07002082 struct socket * sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002083 struct sock *sk = sock->sk;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002084
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085 if (sk)
2086 atomic_dec(&pkt_sk(sk)->mapped);
2087}
2088
2089static struct vm_operations_struct packet_mmap_ops = {
2090 .open = packet_mm_open,
2091 .close =packet_mm_close,
2092};
2093
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002094static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095{
2096 int i;
2097
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002098 for (i = 0; i < len; i++) {
2099 if (likely(pg_vec[i]))
2100 free_pages((unsigned long) pg_vec[i], order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101 }
2102 kfree(pg_vec);
2103}
2104
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002105static inline char *alloc_one_pg_vec_page(unsigned long order)
2106{
Eric Dumazet719bfea2009-04-15 03:39:52 -07002107 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN;
2108
2109 return (char *) __get_free_pages(gfp_flags, order);
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002110}
2111
2112static char **alloc_pg_vec(struct tpacket_req *req, int order)
2113{
2114 unsigned int block_nr = req->tp_block_nr;
2115 char **pg_vec;
2116 int i;
2117
2118 pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL);
2119 if (unlikely(!pg_vec))
2120 goto out;
2121
2122 for (i = 0; i < block_nr; i++) {
2123 pg_vec[i] = alloc_one_pg_vec_page(order);
2124 if (unlikely(!pg_vec[i]))
2125 goto out_free_pgvec;
2126 }
2127
2128out:
2129 return pg_vec;
2130
2131out_free_pgvec:
2132 free_pg_vec(pg_vec, order, block_nr);
2133 pg_vec = NULL;
2134 goto out;
2135}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002136
Johann Baudy69e3c752009-05-18 22:11:22 -07002137static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
2138 int closing, int tx_ring)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002139{
2140 char **pg_vec = NULL;
2141 struct packet_sock *po = pkt_sk(sk);
Al Viro0e11c912006-11-08 00:26:29 -08002142 int was_running, order = 0;
Johann Baudy69e3c752009-05-18 22:11:22 -07002143 struct packet_ring_buffer *rb;
2144 struct sk_buff_head *rb_queue;
Al Viro0e11c912006-11-08 00:26:29 -08002145 __be16 num;
Johann Baudy69e3c752009-05-18 22:11:22 -07002146 int err;
2147
2148 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
2149 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
2150
2151 err = -EBUSY;
2152 if (!closing) {
2153 if (atomic_read(&po->mapped))
2154 goto out;
2155 if (atomic_read(&rb->pending))
2156 goto out;
2157 }
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002158
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159 if (req->tp_block_nr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160 /* Sanity tests and some calculations */
Johann Baudy69e3c752009-05-18 22:11:22 -07002161 err = -EBUSY;
2162 if (unlikely(rb->pg_vec))
2163 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164
Patrick McHardybbd6ef82008-07-14 22:50:15 -07002165 switch (po->tp_version) {
2166 case TPACKET_V1:
2167 po->tp_hdrlen = TPACKET_HDRLEN;
2168 break;
2169 case TPACKET_V2:
2170 po->tp_hdrlen = TPACKET2_HDRLEN;
2171 break;
2172 }
2173
Johann Baudy69e3c752009-05-18 22:11:22 -07002174 err = -EINVAL;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002175 if (unlikely((int)req->tp_block_size <= 0))
Johann Baudy69e3c752009-05-18 22:11:22 -07002176 goto out;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002177 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
Johann Baudy69e3c752009-05-18 22:11:22 -07002178 goto out;
Patrick McHardy8913336a2008-07-18 18:05:19 -07002179 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
Johann Baudy69e3c752009-05-18 22:11:22 -07002180 po->tp_reserve))
2181 goto out;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002182 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
Johann Baudy69e3c752009-05-18 22:11:22 -07002183 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002184
Johann Baudy69e3c752009-05-18 22:11:22 -07002185 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
2186 if (unlikely(rb->frames_per_block <= 0))
2187 goto out;
2188 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
2189 req->tp_frame_nr))
2190 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191
2192 err = -ENOMEM;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002193 order = get_order(req->tp_block_size);
2194 pg_vec = alloc_pg_vec(req, order);
2195 if (unlikely(!pg_vec))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196 goto out;
Johann Baudy69e3c752009-05-18 22:11:22 -07002197 }
2198 /* Done */
2199 else {
2200 err = -EINVAL;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002201 if (unlikely(req->tp_frame_nr))
Johann Baudy69e3c752009-05-18 22:11:22 -07002202 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203 }
2204
2205 lock_sock(sk);
2206
2207 /* Detach socket from network */
2208 spin_lock(&po->bind_lock);
2209 was_running = po->running;
2210 num = po->num;
2211 if (was_running) {
2212 __dev_remove_pack(&po->prot_hook);
2213 po->num = 0;
2214 po->running = 0;
2215 __sock_put(sk);
2216 }
2217 spin_unlock(&po->bind_lock);
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002218
Linus Torvalds1da177e2005-04-16 15:20:36 -07002219 synchronize_net();
2220
2221 err = -EBUSY;
Herbert Xu905db442009-01-30 14:12:06 -08002222 mutex_lock(&po->pg_vec_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002223 if (closing || atomic_read(&po->mapped) == 0) {
2224 err = 0;
2225#define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
Johann Baudy69e3c752009-05-18 22:11:22 -07002226 spin_lock_bh(&rb_queue->lock);
2227 pg_vec = XC(rb->pg_vec, pg_vec);
2228 rb->frame_max = (req->tp_frame_nr - 1);
2229 rb->head = 0;
2230 rb->frame_size = req->tp_frame_size;
2231 spin_unlock_bh(&rb_queue->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002232
Johann Baudy69e3c752009-05-18 22:11:22 -07002233 order = XC(rb->pg_vec_order, order);
2234 req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002235
Johann Baudy69e3c752009-05-18 22:11:22 -07002236 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
2237 po->prot_hook.func = (po->rx_ring.pg_vec) ?
2238 tpacket_rcv : packet_rcv;
2239 skb_queue_purge(rb_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240#undef XC
2241 if (atomic_read(&po->mapped))
Johann Baudy69e3c752009-05-18 22:11:22 -07002242 printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n",
2243 atomic_read(&po->mapped));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002244 }
Herbert Xu905db442009-01-30 14:12:06 -08002245 mutex_unlock(&po->pg_vec_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002246
2247 spin_lock(&po->bind_lock);
2248 if (was_running && !po->running) {
2249 sock_hold(sk);
2250 po->running = 1;
2251 po->num = num;
2252 dev_add_pack(&po->prot_hook);
2253 }
2254 spin_unlock(&po->bind_lock);
2255
2256 release_sock(sk);
2257
Linus Torvalds1da177e2005-04-16 15:20:36 -07002258 if (pg_vec)
2259 free_pg_vec(pg_vec, order, req->tp_block_nr);
2260out:
2261 return err;
2262}
2263
Johann Baudy69e3c752009-05-18 22:11:22 -07002264static int packet_mmap(struct file *file, struct socket *sock,
2265 struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266{
2267 struct sock *sk = sock->sk;
2268 struct packet_sock *po = pkt_sk(sk);
Johann Baudy69e3c752009-05-18 22:11:22 -07002269 unsigned long size, expected_size;
2270 struct packet_ring_buffer *rb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002271 unsigned long start;
2272 int err = -EINVAL;
2273 int i;
2274
2275 if (vma->vm_pgoff)
2276 return -EINVAL;
2277
Herbert Xu905db442009-01-30 14:12:06 -08002278 mutex_lock(&po->pg_vec_lock);
Johann Baudy69e3c752009-05-18 22:11:22 -07002279
2280 expected_size = 0;
2281 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2282 if (rb->pg_vec) {
2283 expected_size += rb->pg_vec_len
2284 * rb->pg_vec_pages
2285 * PAGE_SIZE;
2286 }
2287 }
2288
2289 if (expected_size == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002290 goto out;
Johann Baudy69e3c752009-05-18 22:11:22 -07002291
2292 size = vma->vm_end - vma->vm_start;
2293 if (size != expected_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002294 goto out;
2295
Linus Torvalds1da177e2005-04-16 15:20:36 -07002296 start = vma->vm_start;
Johann Baudy69e3c752009-05-18 22:11:22 -07002297 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2298 if (rb->pg_vec == NULL)
2299 continue;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002300
Johann Baudy69e3c752009-05-18 22:11:22 -07002301 for (i = 0; i < rb->pg_vec_len; i++) {
2302 struct page *page = virt_to_page(rb->pg_vec[i]);
2303 int pg_num;
2304
2305 for (pg_num = 0; pg_num < rb->pg_vec_pages;
2306 pg_num++,page++) {
2307 err = vm_insert_page(vma, start, page);
2308 if (unlikely(err))
2309 goto out;
2310 start += PAGE_SIZE;
2311 }
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002312 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313 }
Johann Baudy69e3c752009-05-18 22:11:22 -07002314
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002315 atomic_inc(&po->mapped);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002316 vma->vm_ops = &packet_mmap_ops;
2317 err = 0;
2318
2319out:
Herbert Xu905db442009-01-30 14:12:06 -08002320 mutex_unlock(&po->pg_vec_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002321 return err;
2322}
2323#endif
2324
2325
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08002326static const struct proto_ops packet_ops_spkt = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002327 .family = PF_PACKET,
2328 .owner = THIS_MODULE,
2329 .release = packet_release,
2330 .bind = packet_bind_spkt,
2331 .connect = sock_no_connect,
2332 .socketpair = sock_no_socketpair,
2333 .accept = sock_no_accept,
2334 .getname = packet_getname_spkt,
2335 .poll = datagram_poll,
2336 .ioctl = packet_ioctl,
2337 .listen = sock_no_listen,
2338 .shutdown = sock_no_shutdown,
2339 .setsockopt = sock_no_setsockopt,
2340 .getsockopt = sock_no_getsockopt,
2341 .sendmsg = packet_sendmsg_spkt,
2342 .recvmsg = packet_recvmsg,
2343 .mmap = sock_no_mmap,
2344 .sendpage = sock_no_sendpage,
2345};
Linus Torvalds1da177e2005-04-16 15:20:36 -07002346
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08002347static const struct proto_ops packet_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348 .family = PF_PACKET,
2349 .owner = THIS_MODULE,
2350 .release = packet_release,
2351 .bind = packet_bind,
2352 .connect = sock_no_connect,
2353 .socketpair = sock_no_socketpair,
2354 .accept = sock_no_accept,
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002355 .getname = packet_getname,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002356 .poll = packet_poll,
2357 .ioctl = packet_ioctl,
2358 .listen = sock_no_listen,
2359 .shutdown = sock_no_shutdown,
2360 .setsockopt = packet_setsockopt,
2361 .getsockopt = packet_getsockopt,
2362 .sendmsg = packet_sendmsg,
2363 .recvmsg = packet_recvmsg,
2364 .mmap = packet_mmap,
2365 .sendpage = sock_no_sendpage,
2366};
2367
2368static struct net_proto_family packet_family_ops = {
2369 .family = PF_PACKET,
2370 .create = packet_create,
2371 .owner = THIS_MODULE,
2372};
2373
2374static struct notifier_block packet_netdev_notifier = {
2375 .notifier_call =packet_notifier,
2376};
2377
2378#ifdef CONFIG_PROC_FS
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002379static inline struct sock *packet_seq_idx(struct net *net, loff_t off)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002380{
2381 struct sock *s;
2382 struct hlist_node *node;
2383
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08002384 sk_for_each(s, node, &net->packet.sklist) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002385 if (!off--)
2386 return s;
2387 }
2388 return NULL;
2389}
2390
2391static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
Eric Dumazet40ccbf52008-01-07 22:39:57 -08002392 __acquires(seq_file_net(seq)->packet.sklist_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002393{
Denis V. Luneve372c412007-11-19 22:31:54 -08002394 struct net *net = seq_file_net(seq);
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08002395 read_lock(&net->packet.sklist_lock);
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002396 return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002397}
2398
2399static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2400{
Herbert Xu1bf40952007-12-16 14:04:02 -08002401 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002402 ++*pos;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002403 return (v == SEQ_START_TOKEN)
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08002404 ? sk_head(&net->packet.sklist)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002405 : sk_next((struct sock*)v) ;
2406}
2407
2408static void packet_seq_stop(struct seq_file *seq, void *v)
Eric Dumazet40ccbf52008-01-07 22:39:57 -08002409 __releases(seq_file_net(seq)->packet.sklist_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002410{
Herbert Xu1bf40952007-12-16 14:04:02 -08002411 struct net *net = seq_file_net(seq);
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08002412 read_unlock(&net->packet.sklist_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002413}
2414
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002415static int packet_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002416{
2417 if (v == SEQ_START_TOKEN)
2418 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
2419 else {
2420 struct sock *s = v;
2421 const struct packet_sock *po = pkt_sk(s);
2422
2423 seq_printf(seq,
2424 "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
2425 s,
2426 atomic_read(&s->sk_refcnt),
2427 s->sk_type,
2428 ntohs(po->num),
2429 po->ifindex,
2430 po->running,
2431 atomic_read(&s->sk_rmem_alloc),
2432 sock_i_uid(s),
2433 sock_i_ino(s) );
2434 }
2435
2436 return 0;
2437}
2438
Philippe De Muyter56b3d972007-07-10 23:07:31 -07002439static const struct seq_operations packet_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002440 .start = packet_seq_start,
2441 .next = packet_seq_next,
2442 .stop = packet_seq_stop,
2443 .show = packet_seq_show,
2444};
2445
2446static int packet_seq_open(struct inode *inode, struct file *file)
2447{
Denis V. Luneve372c412007-11-19 22:31:54 -08002448 return seq_open_net(inode, file, &packet_seq_ops,
2449 sizeof(struct seq_net_private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002450}
2451
Arjan van de Venda7071d2007-02-12 00:55:36 -08002452static const struct file_operations packet_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002453 .owner = THIS_MODULE,
2454 .open = packet_seq_open,
2455 .read = seq_read,
2456 .llseek = seq_lseek,
Denis V. Luneve372c412007-11-19 22:31:54 -08002457 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002458};
2459
2460#endif
2461
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002462static int packet_net_init(struct net *net)
2463{
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08002464 rwlock_init(&net->packet.sklist_lock);
2465 INIT_HLIST_HEAD(&net->packet.sklist);
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002466
2467 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
2468 return -ENOMEM;
2469
2470 return 0;
2471}
2472
2473static void packet_net_exit(struct net *net)
2474{
2475 proc_net_remove(net, "packet");
2476}
2477
2478static struct pernet_operations packet_net_ops = {
2479 .init = packet_net_init,
2480 .exit = packet_net_exit,
2481};
2482
2483
Linus Torvalds1da177e2005-04-16 15:20:36 -07002484static void __exit packet_exit(void)
2485{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002486 unregister_netdevice_notifier(&packet_netdev_notifier);
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002487 unregister_pernet_subsys(&packet_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002488 sock_unregister(PF_PACKET);
2489 proto_unregister(&packet_proto);
2490}
2491
2492static int __init packet_init(void)
2493{
2494 int rc = proto_register(&packet_proto, 0);
2495
2496 if (rc != 0)
2497 goto out;
2498
2499 sock_register(&packet_family_ops);
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002500 register_pernet_subsys(&packet_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002501 register_netdevice_notifier(&packet_netdev_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002502out:
2503 return rc;
2504}
2505
2506module_init(packet_init);
2507module_exit(packet_exit);
2508MODULE_LICENSE("GPL");
2509MODULE_ALIAS_NETPROTO(PF_PACKET);